Shaka Smart is a big name at the NBA level? Even Ollie is borderline. Vogel and Blatt had real interest, and there were reports that Thibs badly wanted the job, even without the power he got in Minnesota. Hornacek getting the job doesn't mean its not a desireable job.
Anthony's contract isn't going to keep them from upgrading the roster in the short term, they will have max level cap space this year and maybe next year too. They might be better off trying to trade him and go through a full rebuild, but if they don't they'll still have opportunities to improve the roster.